Golang Gin框架实现文件下载功能的示例代码

2023-04-10 07:31| 来源: 网络整理| 查看: 265

目录Layui框架实现文件上传

基本的思路就是随便创建一个元素，然后使用layui的upload组件对创建的元素进行渲染，详见代码

+添加附件 //以layui.js的方式引入使用时需要手动加载layui的组件 layui.use(['layer','upload'],function(){ // PS：个人理解，该行只是为了引入layui框架的组件，html文件加载完毕后执行，内部的代码和直接写在script标签内没啥区别，只是可以在代码中使用layer了 // 此处引入layer只是为了打印一些东西 var layer = layui.layer, upload = layui.upload; // 渲染元素，使其支持文件上传 // 详情请移步 https://www.layui.com/doc/modules/upload.html // https://www.layui.com/demo/upload.html upload.render({ elem: '#attachment-upload', // 感觉利用了jquery的id选择器，这里用#id(上传附件的标签、按钮值类型元素id)就可以了 url: dev_url + "fc/upload", // 后端接收上传文件的接口地址 headers: { // 这里官方文档中没有，是在请求后端接口时在request header中增加一些请求参数，实测可行 'api_token': uInfo }, accept: 'file', // 这里可以限定支持上传文件的类型，详见文档 done: function (res) { // 调用后端上传文件接口后的返回 // 这里解析下后端的返回字段，具体怎么着看业务吧 if (res.success == false) { layer.msg("上传文件失败!" + res.msg); } }); })

PS：注意下使用layui上传文件的请求格式为multiply/form-data，参数为file,(binary)格式

layui上传文件组件请求

Gin框架获取前端上传的文件 func UploadFileControl(c *gin.Context) { logrus.Infof("[UploadFileControl] user_id =%d", userId) // GIN框架获取前端上传文件 // 这里的参数其实是上传文件时的字段名，也就是上面图片中的file，如果前端是自己定义的其他字段名，需要替换下 uploadFile, fileHeader, err := c.Request.FormFile("file") if err != nil { c.JSON(http.StatusOK, gin.H{ "success": false, "msg": "获取文件信息失败!" + err.Error(), }) } if uploadFile != nil { // 记得及时关闭文件，避免内存泄漏 defer uploadFile.Close() } // 读取上传文件的内容 // 其实这里直接读取所有不太合理,如果文件过大时会占用很多内存，可以考虑使用缓冲区读取 fileContent, err := ioutil.ReadAll(uploadFile) if err != nil { c.JSON(http.StatusOK, gin.H{ "success": false, "msg": "读取文件内容失败!" + err.Error(), }) } // 接受到文件后的处理方式，可以保存到本地，也可以上传到文件对象，看自己了 /*fileId, err := oss.GetOssClient().UploadFile(userId, fileHeader.Filename, fileContent) if err != nil { logrus.Errorf("[UploadFile] error,user_id = %d,err_msg= %s", userId, err.Error()) c.JSON(http.StatusOK, gin.H{ "success": false, "msg": "上传文件失败!请稍后再试", }) }*/ // 这里向前端返回下上传成功的信息 c.JSON(http.StatusOK, gin.H{ "success": true, "msg": "", }) } Gin框架的文件下载

Response Header中的Content-Type指定了服务器端返回数据的类型，浏览器自己是可以处理这些类型的，当返回的数据为文件类型时，浏览器会自行下载。具体的类型和content-type的对应方式可见

文件扩展名 Content-Type(Mime-Type) 文件扩展名 Content-Type(Mime-Type) .*（二进制流，不知道下载文件类型） application/octet-stream .tif image/tiff .001 application/x-001 .301 application/x-301 .323 text/h323 .906 application/x-906 .907 drawing/907 .a11 application/x-a11 .acp audio/x-mei-aac .ai application/postscript .aif audio/aiff .aifc audio/aiff .aiff audio/aiff .anv application/x-anv .asa text/asa .asf video/x-ms-asf .asp text/asp .asx video/x-ms-asf .au audio/basic .avi video/avi .awf application/vnd.adobe.workflow .biz text/xml .bmp application/x-bmp .bot application/x-bot .c4t application/x-c4t .c90 application/x-c90 .cal application/x-cals .cat application/vnd.ms-pki.seccat .cdf application/x-netcdf .cdr application/x-cdr .cel application/x-cel .cer application/x-x509-ca-cert .cg4 application/x-g4 .cgm application/x-cgm .cit application/x-cit .class java/* .cml text/xml .cmp application/x-cmp .cmx application/x-cmx .cot application/x-cot .crl application/pkix-crl .crt application/x-x509-ca-cert .csi application/x-csi .css text/css .cut application/x-cut .dbf application/x-dbf .dbm application/x-dbm .dbx application/x-dbx .dcd text/xml .dcx application/x-dcx .der application/x-x509-ca-cert .dgn application/x-dgn .dib application/x-dib .dll application/x-msdownload .doc application/msword .dot application/msword .drw application/x-drw .dtd text/xml .dwf Model/vnd.dwf .dwf application/x-dwf .dwg application/x-dwg .dxb application/x-dxb .dxf application/x-dxf .edn application/vnd.adobe.edn .emf application/x-emf .eml message/rfc822 .ent text/xml .epi application/x-epi .eps application/x-ps .eps application/postscript .etd application/x-ebx .exe application/x-msdownload .fax image/fax .fdf application/vnd.fdf .fif application/fractals .fo text/xml .frm application/x-frm .g4 application/x-g4 .gbr application/x-gbr . application/x- .gif image/gif .gl2 application/x-gl2 .gp4 application/x-gp4 .hgl application/x-hgl .hmr application/x-hmr .hpg application/x-hpgl .hpl application/x-hpl .hqx application/mac-binhex40 .hrf application/x-hrf .hta application/hta .htc text/x-component .htm text/html .html text/html .htt text/webviewhtml .htx text/html .icb application/x-icb .ico image/x-icon .ico application/x-ico .iff application/x-iff .ig4 application/x-g4 .igs application/x-igs .iii application/x-iphone .img application/x-img .ins application/x-internet-signup .isp application/x-internet-signup .IVF video/x-ivf .java java/* .jfif image/jpeg .jpe image/jpeg .jpe application/x-jpe .jpeg image/jpeg .jpg image/jpeg .jpg application/x-jpg .js application/x-javascript .jsp text/html .la1 audio/x-liquid-file .lar application/x-laplayer-reg .latex application/x-latex .lavs audio/x-liquid-secure .lbm application/x-lbm .lmsff audio/x-la-lms .ls application/x-javascript .ltr application/x-ltr .m1v video/x-mpeg .m2v video/x-mpeg .m3u audio/mpegurl .m4e video/mpeg4 .mac application/x-mac .man application/x-troff-man .math text/xml .mdb application/msaccess .mdb application/x-mdb .mfp application/x-shockwave-flash .mht message/rfc822 .mhtml message/rfc822 .mi application/x-mi .mid audio/mid .midi audio/mid .mil application/x-mil .mml text/xml .mnd audio/x-musicnet-download .mns audio/x-musicnet-stream .mocha application/x-javascript .movie video/x-sgi-movie .mp1 audio/mp1 .mp2 audio/mp2 .mp2v video/mpeg .mp3 audio/mp3 .mp4 video/mpeg4 .mpa video/x-mpg .mpd application/vnd.ms-project .mpe video/x-mpeg .mpeg video/mpg .mpg video/mpg .mpga audio/rn-mpeg .mpp application/vnd.ms-project .mps video/x-mpeg .mpt application/vnd.ms-project .mpv video/mpg .mpv2 video/mpeg .mpw application/vnd.ms-project .mpx application/vnd.ms-project .mtx text/xml .mxp application/x-mmxp .net image/pnetvue .nrf application/x-nrf .nws message/rfc822 .odc text/x-ms-odc .out application/x-out .p10 application/pkcs10 .p12 application/x-pkcs12 .p7b application/x-pkcs7-certificates .p7c application/pkcs7-mime .p7m application/pkcs7-mime .p7r application/x-pkcs7-certreqresp .p7s application/pkcs7-signature .pc5 application/x-pc5 .pci application/x-pci .pcl application/x-pcl .pcx application/x-pcx .pdf application/pdf .pdf application/pdf .pdx application/vnd.adobe.pdx .pfx application/x-pkcs12 .pgl application/x-pgl .pic application/x-pic .pko application/vnd.ms-pki.pko .pl application/x-perl .plg text/html .pls audio/scpls .plt application/x-plt .png image/png .png application/x-png .pot application/vnd.ms-powerpoint .ppa application/vnd.ms-powerpoint .ppm application/x-ppm .pps application/vnd.ms-powerpoint .ppt application/vnd.ms-powerpoint .ppt application/x-ppt .pr application/x-pr .prf application/pics-rules .prn application/x-prn .prt application/x-prt .ps application/x-ps .ps application/postscript .ptn application/x-ptn .pwz application/vnd.ms-powerpoint .r3t text/vnd.rn-realtext3d .ra audio/vnd.rn-realaudio .ram audio/x-pn-realaudio .ras application/x-ras .rat application/rat-file .rdf text/xml .rec application/vnd.rn-recording .red application/x-red .rgb application/x-rgb .rjs application/vnd.rn-realsystem-rjs .rjt application/vnd.rn-realsystem-rjt .rlc application/x-rlc .rle application/x-rle .rm application/vnd.rn-realmedia .rmf application/vnd.adobe.rmf .rmi audio/mid .rmj application/vnd.rn-realsystem-rmj .rmm audio/x-pn-realaudio .rmp application/vnd.rn-rn_music_package .rms application/vnd.rn-realmedia-secure .rmvb application/vnd.rn-realmedia-vbr .rmx application/vnd.rn-realsystem-rmx .rnx application/vnd.rn-realplayer .rp image/vnd.rn-realpix .rpm audio/x-pn-realaudio-plugin .rsml application/vnd.rn-rsml .rt text/vnd.rn-realtext .rtf application/msword .rtf application/x-rtf .rv video/vnd.rn-realvideo .sam application/x-sam .sat application/x-sat .sdp application/sdp .sdw application/x-sdw .sit application/x-stuffit .slb application/x-slb .sld application/x-sld .slk drawing/x-slk .smi application/smil .smil application/smil .smk application/x-smk .snd audio/basic .sol text/plain .sor text/plain .spc application/x-pkcs7-certificates .spl application/futuresplash .spp text/xml .ssm application/streamingmedia .sst application/vnd.ms-pki.certstore .stl application/vnd.ms-pki.stl .stm text/html .sty application/x-sty .svg text/xml .swf application/x-shockwave-flash .tdf application/x-tdf .tg4 application/x-tg4 .tga application/x-tga .tif image/tiff .tif application/x-tif .tiff image/tiff .tld text/xml .top drawing/x-top .torrent application/x-bittorrent .tsd text/xml .txt text/plain .uin application/x-icq .uls text/iuls .vcf text/x-vcard .vda application/x-vda .vdx application/vnd.visio .vml text/xml .vpg application/x-vpeg005 .vsd application/vnd.visio .vsd application/x-vsd .vss application/vnd.visio .vst application/vnd.visio .vst application/x-vst .vsw application/vnd.visio .vsx application/vnd.visio .vtx application/vnd.visio .vxml text/xml .wav audio/wav .wax audio/x-ms-wax .wb1 application/x-wb1 .wb2 application/x-wb2 .wb3 application/x-wb3 .wbmp image/vnd.wap.wbmp .wiz application/msword .wk3 application/x-wk3 .wk4 application/x-wk4 .wkq application/x-wkq .wks application/x-wks .wm video/x-ms-wm .wma audio/x-ms-wma .wmd application/x-ms-wmd .wmf application/x-wmf .wml text/vnd.wap.wml .wmv video/x-ms-wmv .wmx video/x-ms-wmx .wmz application/x-ms-wmz .wp6 application/x-wp6 .wpd application/x-wpd .wpg application/x-wpg .wpl application/vnd.ms-wpl .wq1 application/x-wq1 .wr1 application/x-wr1 .wri application/x-wri .wrk application/x-wrk .ws application/x-ws .ws2 application/x-ws .wsc text/scriptlet .wsdl text/xml .wvx video/x-ms-wvx .xdp application/vnd.adobe.xdp .xdr text/xml .xfd application/vnd.adobe.xfd .xfdf application/vnd.adobe.xfdf .xhtml text/html .xls application/vnd.ms-excel .xls application/x-xls .xlw application/x-xlw .xml text/xml .xpl audio/scpls .xq text/xml .xql text/xml .xquery text/xml .xsd text/xml .xsl text/xml .xslt text/xml .xwd application/x-xwd .x_b application/x-x_b .sis application/vnd.symbian.install .sisx application/vnd.symbian.install .x_t application/x-x_t .ipa application/vnd.iphone .apk application/vnd.android.package-archive .xap application/x-silverlight-app

当Content-Type是一些文件类型时，使用Content-Disposition可以指定浏览器下载文件时的默认文件名因此，我们想要使用gin实现下载文件的功能，只需要在接口返回时设置Response-Header中的Content-Type为文件类型，并设置Content-Disposition指定默认的文件名，然后将文件数据返回浏览器即可，具体代码如下：

func DownloadFileControl(c *gin.Context) { // 查询一些必要的参数进行一些必要的验证 attchIdStr := c.Query("attachment_id") attachmentName = c.Query("attachment_name") // 获取要返回的文件数据流 // 看你文件存在哪里了，本地就直接os.Open就可以了，总之是要获取一个[]byte /* fileContent, err := oss.GetOssClient().DownloadFile(req.AttachmentId, req.AttachmentName) if err != nil { logrus.Errorf("[DownloadFile] download file error,file_id = %d,file_name = %s,user_is = %d,err_msg= %s", req.UserId, req.AttachmentId, req.AttachmentName, err.Error()) c.JSON(http.StatusOK, gin.H{ "success": false, "msg": "下载文件失败,请联系管理员", }) return }*/ // 设置返回头并返回数据 fileContentDisposition := "attachment;filename=\"" + attachmentName + "\"" c.Header("Content-Type", "application/zip") // 这里是压缩文件类型 .zip c.Header("Content-Disposition", fileContentDisposition) c.Data(http.StatusOK, contentType, fileContent) 您可能感兴趣的文章:

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